Solar water heating unit



FIG. 1 is a top, front perspective view of a solar water heating unit, showing my new design;

FIG. 2 is a left side elevational view, shown on a slightly larger scale;

FIG. 3 is a top, rear perspective view thereof;

FIG. 4 is a bottom perspective view thereof. 

The ornamental design for a solar water heating unit, as shown and described. 